Trolley-wheel



PATENTED FEB. 9, 1904.

J. E. PALMER.

TROLLEY WHEEL.

APPLICATION FILED NOV.14, 1903.

H0 MODEL.

Patented February 9, 1904.

UNITED STATES PATENT OFFICE.

JOHN E. PALMER, OF SOMERVILLE, MASSACHUSETTS.

TROLLEY-WHEEL.

SPECIFICATION forming part of Letters Patent No. 751,749, dated February9, 1904:.

Application filed November 14:, 1903. Serial N0.181,169. (N0 model.)

To all whom, it may concern:

Be it known that I, JOHN EDWIN PALMER, a citizen of the United States,residing at Somerville, in the county of Middlesex and State of illassachusetts, have invented certain new and useful Improvements inTrolley-1V heels, of which the following is a specification, referencebeing had therein to the accompanying drawings.

This invention relates to trolley-wheels; and its primary object is toprovide the wheel with means for preventing it becoming disengaged fromthe trolley-wire and with means for making the wheel adaptable to theconditions incident to rounding curves, &c.

Novel details in the arrangement and construction of the several partsof the trolleywheel will be apparent from the detail descriptionhereinafter when read in connection with the accompanying drawings,forming part hereof, and the appended claims.

In the said drawings a preferable embodiment of the invention isdelineated for purposes of illustration, and when referring to the samelike reference characters refer to corre sponding parts inboth views,whereof Figure 1 is a plan view, and Fig. 2 is a longitudinal verticalcentral sectional View.

Referring more particularly to the drawings, l designates thetrolley-fork, on the prongs 2 of which is hung the shaft 3. The shaft 3carries independently-rotatable longitudinally-movable sections 4.Between sections 4: is placed on shaft 3 an independentlyrotatablesection 5, having inwardly-inclining surfaces 6, leading to acircumferential centrally-disposed groove 7, for normally carrying thetrolley-wires Section 5 is partially enveloped at its ends by sections4, and the latter sections are held normally in proximity to each otherby coiled springs 8 on shaft 3 and interposed between prongs 2 of fork 1and sections 4 and which exert an inward pressure against sections 4:.Section 5 prevents the spring from causing sections 4c to come incontact with each other, section 5 bearing against sections 1 at hubs 9.Sections 4: carry inwardly-projecting hook-shaped members 10,overhanging section 5.

1V hen the trolley is in use, section 5 is engaged by the trolley-wire,which runs in groove 7, the section rotating on shaft 3. Sections 4rotate or remain substantially still on the shaft.

1n rounding curves or under any other conditions when the trolley-wireis not at substantially right angles to the shaft the wire will engagethe inclining surfaces 6 of section 5, thereby securing morerunning-space.

The overhanging hooks 10 serve to prevent the wire from leaving thepulley, and should this happen under extraordinary conditions, thetrolley being returned to the wire and the wire coming betweeninwardly-inclining faces 11 of the hooks 10, the hooks and the sectioncarrying them will be opened by the wire and the wire permitted to dropinto position between sections 4 and on section 5. 4

Having thus described my invention, What I claim as new, and desire tosecure by Letters Patent, is

1. In a trolley-wheel, a shaft, suitable support therefor,independently-rotatable sections thereon, another independentlyrotatablesection between said other sections for engaging the trolley-wire, andhooks on said first-mentioned sections and overhanging saidwire-engaging section for preventing the disengagement of the wiretherefrom, substantially as described.

2. In a trolley-wheel, a shaft, suitable support therefor,independentlyrotatable sections thereon, another independently-rotatablesection between said other sections for engaging the trolley-wire, hookson said firstmentioned sections and overhanging said Wireengagingsection for preventing the disengagement of the wire therefrom, andmeans for keeping said hooks of one section adjacent the hooks of theother section, substantially as described.

3. In a trolley-wheel, a shaft, suitable support therefor,independentlyrotatable sections thereon, another independently-rotatablesection between said other sections for engaging the trolley-wire, bookson said first- Inentioned sections and overhanging said wireengagingsection for preventing the disengagement of the wire therefrom, andmeans for normally holding said sections together, substantially asdescribed.

4:. In a trolley-wheel, a shaft, suitable support therefor,independently-rotatable sections thereon, anotherindependently-rotatable section between said other sections for engagingthe trolley-Wire, hooks on said firstmentioned sections and overhangingsaid Wireengaging section for preventing the disengagement of the wiretherefrom, inclines on said hooks for causing the same to spread apartwhen downwardly pressed against by the trolley-Wire, and means fornormally holding said sections together, substantially as described.

5. In a trolley-wheel, a shaft, suitable support therefor,independently-rotatable sections thereon, anotherindependently-rotatable section between said other sections for engagingthe trolley-wire, hooks on said firstmentioned sections and overhangingsaid wireengaging sections for preventing the disengagement of the wiretherefrom, and coiled springs on said shaft for holding said sectionstogether, substantially as described.

In testimony whereof I afiix my signature in presence of two Witnesses.

JOHN E. PALMER.

Witnesses:

PHIL]? HIGHLEY, JOSEPH J. GILES.

